Quote Originally Posted by Boanerges View Post
It is just crazy to me that it would loose it's effectiveness so fast just being in water...
Actually many chemicals rapidly break down in an aqueous solution. I don't know specifics about chlorhexidine, but its not that uncommon.

I mix up a new batch everytime I clean. I got a gallon of the concentrate which = 128 gallons or working solution. I just mix up enough for a spray bottle's worth, I've had that gallon a couple of years, and its barely 1/4 of the way down. So far worth every penny I spent on it.

I figure its better safe than sorry, and with it being so cheap, no reason not to.